I am not real fond of the soaking method. 99% of paints are resistant to WD40 and other oils, but I would not want to find the paint job that wasn't resistant. Once upon a time, I dropped ONE drop of brake fluid on a front fender, and by the time I picked up a rag to wipe it off, the fluid dissolved a hole into the paint[/emoticons/emotion-6.gif] Not good! Heat will work best, and as long as you can put your hand in front of the heat source, it won't be too hot for the paint. Then you can clean up the adhesive with WD40, and remove the WD40 with glass cleaner.
TJ